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The architecture and construction of a simple embedded web server system with due account of its application for remote condition monitoring of a photovoltaic (PV) installation is presented. The system, which is based on a PIC18 microcontroller, uses the Internet as a medium for communications between a central control point and a PV system. It allows various parameters of a PV installation such as...
This paper presents the architecture of a hybrid phase lock loop circuit topology for synchronizing a single-phase inverter fed from a renewable energy source such as a photovoltaic (PV) generator to the low voltage utility grid. The system uses a digital phase lock loop (DPLL) architecture, which is based on the arctan phase detector, driving a phase lock loop (PLL) to synchronize a PV generator...
A new technique for fast error correction of the TDTL (time delay digital tanlock loop) is proposed. The technique is based on early comparison of the input signal frequency with that of the loop filter output. The result of this comparison is then used to select an optimum value for the loop filter output. This technique eliminates the need for continuously changing the loop filter coefficient. The...
A circuit topology for an AC-DC single-phase single-stage half-controlled converter with reduced line current harmonics is presented. It is shown that these harmonics are reduced below limits imposed by relevant international standards governing the generation and injection of harmonics into the distribution systems by equipment which draws current less than 16 A. The paper also demonstrates the use...
The diagnosis of sinus diseases (e.g. malignant disease) requires the segmentation of bone structure surrounding the sinus areas in CT (computer tomography) images. The non-uniformity of bone tissue, ranging from dense cortical bone to textured spongy bone, the irregular shapes of closely packed bones, and the small inter-bone spaces compared to the resolution of a CT image coupled with the presence...
This paper proposes two circuit topologies for acquisition enhancement in a time delay digital tanlock loop (TDTL). They are based on feedforward (FF) and feedback (FB) control schemes. Both schemes are used to improve the acquisition speed of the conventional TDTL by employing an auxiliary circuit. The ultimate objective of the FB and FF techniques is to control the damping ratio so as to prevent...
A microcontroller-based circuit topology for a single-stage single-phase AC-DC converter with line current harmonics minimisation properties is presented. The circuit is based on the half-controlled AC-DC converter circuit in which the active devices are two power MOSFET transistors. The switching action of the transistors controls the shape and hence the harmonic content of the supply current to...
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